In 950 BC the Arabs knew the name of God as Yahwah, but because Yahwah would not curse the Jews for them, His name was not spoken again by them.
Here is proof that the Arabs knew the God of Abraham as Yahwah, and not Allah.
Moabite Stone, 950 BC.
I am Mesha, son of Kemosh melek, the king of Moab, the Dibonite. My father was king over Moab for thirty years, and I became king after my father.
And I made this high place for Kemosh in Qarhar . . . because of the deliverance of Mesha, and because he has saved me from all the kings and because he caused me to see [my desire] upon all who hated me. Omri, king of Israel -- he oppressed Moab many days, because Chemosh was angry with his land.
And his son succeeded him, and he also said I will oppress Moab. In my day he spoke according to this word, but I saw my desire upon him and upon his house, and Israel utterly perished forever.
Now Omri had possessed all the land of Medeba and dwelt in it his days and half the days of his son, forty years, but Chemosh restored it in my day. And I built Baal-meon and I made in it the reservoir and I built Kiryathaim. And the men of Gad had dwelt in the land of Ataroth from of old and the king of Israel had built for himself Ataroth. And I foutht against the city and took it, and I slew all the people of the city, a sight pleasing to Chemosh and to Moab.
And I brought back from there the altar-hearth of Duda and I dragged it before Chemosh in Kiryoth. And I caused to dwell in it the men of Sharon and the men of Meharoth (?).
And Chemosh said to me: "Go take Nebo against Israel"; and I went by night and fought against it from break of dawn till noon, and I took it and slew all, seven thousand men and boys, women and girls, and I devoted it to Ashtar-Chemosh.
And I took from there the altar-hearths of Yahwah, and I dragged them before Chemosh. And the king of Israel built Jabaz and dwelt in it while he fought with..........